闪烁光激励下大芯径阶跃光纤系统的时间响应研究
Time response of large-core step-index fiber transmission system with scintillator illumination
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摘要: 引入材料色散和漏泄模式光线的传输效应，对D. Gloge多模光纤脉冲响应公式进行修正，利用修正后公式数值计算了在闪烁光激励下纤芯半径为0.1 mm、长50 m的石英阶跃光纤的冲击响应波形，该波形近似一高斯函数，半高宽为3 ns,前沿比后沿慢0.8 ns，且后沿存在拖尾。用该响应波形通过数值方法得到了闪烁体-光纤系统时间响应波形，与实验结果相比较，两者基本吻合。
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关键词:
- 大芯径阶跃光纤 /
- 光纤冲击响应函数 /
- 漏泄模式光线 /
- 闪烁体-光纤无源探测系统
Abstract: Considering material dispersion and tunneling ray, the D.Gloge’s theory formula of time response of multimode step-index fiber is modified. The modified formula is used to calculate the function of time response of 50 m long, 0.2 mm core diameter step-index fiber with scintillator illumination. Results show that it is near a Gaussian distribution with FWHM 3.0 ns, the pulse risetime is more than the falling time and the falling time has a trailing.Time response of scintillator-fiber system is modeled by numerical method, the results of modeling accords with experimental results. -
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